-90
180 - 90 is 90
90 divided by 9 is 10 so you can subtract 9 from 90 for 10 times before you reach 0 if you want to go into negative numbers you can keep subtracting as many times as you like you are sooooooooo wrong WOW. You can subtract 9 once from 90 because once you subtract 9 from 90, 90 becomes 81. That's how I do it
-90
No, it is not.
41
119
-232
1971
81/90 - 40/90 = 41/90
complementary angles add to 90 degrees subtract from 90 90-35 = 55
Subtract the angle from 90 degrees and you have the complement Subtract the angle from 180 degrees and you have the supplement